The Ranx Balaur are a great place for you to level from 39 to 40. They are pretty darn squishy and are spread out enough to where you won't agro more then one when attacking them. There are two camps of Balaur here one is to the northern section of the island and the other is to the southern section of the island. As an Asmodian I recommend sticking to the northern side of this Island since we have a safe spot nearby.
If an Elyos tries to gank you, you are able to fly to the group of Asmodians right under where it says Rock on the map. Also if you feel unsafe you are also able to place a kisk at this location.
Tough Balaur Meat
Hard Balaur Skin
Hard Balaur Scale
Vicious Mind of Wrath
Hard Balaur Horn
Of course I'm not listing the other items you can get such as Manastones, Greens, Blues, Oranges and other goodies. These should be no brainers that they are quite valuable. Of course the best part of it all is that the Balaur also drop Kinah.
As well as other Balaur parts listed above.